Metal working apparatus and methods of piercing

• US 3,962,897 A
• Filed: 05/11/1970
• Issued: 06/15/1976
• Est. Priority Date: 10/05/1965
• Status: Expired due to Term

• Current Assignee: Columbiana Foundry Company
• Original Assignee: Columbiana Foundry Company
• Inventors: Williams, Robert C., Way, Lewis A.
• Primary Examiner(s): Larson, Lowell A.
• Assistant Examiner(s): Combs, E. M.
• Application Number:
  US05/036,406
• Time in Patent Office: 2,227 Days
• Field of Search: 72/67, 72/209, 72/368, 72/370, 75/122, 75/126, 75/128, 75/134, 75/170, 75/171, 148/32
• US Class Current: 72/209
• CPC Class Codes: B21B 19/04 Rolling basic material of solid, i.e. non-hollow, structure; Piercing , e.g. rotary piercing mills
• CPC Class Codes: B21B 25/00 Mandrels for metal tube rolling mills, e.g. mandrels of the types used in the methods covered by group B21B17/00; Accessories or auxiliary means therefor ; Construction of, or alloys for, mandrels or plugs

Abstract

A method and apparatus are provided for piercing metal members at high temperatures, particularly members containing slag inclusions, by the steps of urging said member, over a piercer point by rolling whereby said point passes through and forms an axial opening in the ingot, said point being formed of an alloy comprising 0.015% to 2% Carbon, about 5% to 65% Cobalt, about 15% to 35% Chromium and up to about 30% iron.

Claims

1. A method of piercing metal members, particularly members containing slag inclusions comprising the steps of urging said member at a temperature above about 1750°

F over an as formed cast piercer point by rolling whereby said point passes through and forms an axial opening in the ingot, said point being formed of an alloy consisting essentially of about 0.015% to 2% carbon, about 5% to 65% cobalt, about 15% to 35% chromium and about up to 30% iron.

2. A method of piercing metal as claimed in claim 1 wherein the alloy consists essentially of 0.03% to 1.5% carbon, about 40% to 65% cobalt, about 18% to 28% chromium and up to 12% iron.

3. A method of piercing metal as claimed in claim 1 wherein the alloy consists essentially of about 0.6% to 0.8% carbon, about 58% to 62% cobalt, about 18% to 28% chromium and up to 12% iron.

4. In a metal piercing apparatus for piercing elongated metal members at elevated temperatures the combination of at least two spaced apart cooperating rolls and a generally conical piercer point generally between said spaced rolls, said point being composed of an as formed cast alloy, consisting essentially of about 0.015% to 2% carbon, about 5% to 65% cobalt, about 15% to 35% chromium and up to 30% iron.